donnk is right, for mining, the ship has basically sailed. Even if you pay for a miner, you might be better off just putting the money you would spend on a miner directly into bitcoin. Just by letting it sit your value might grow faster than if you mined.

Start lurking on bitcointalk.org. If you are really keen on an answer to your questions about software and anti-virus post there. When you post, be specific. I can only guess that you tried to download cgminer. If you really really want in on bitcoin you will need to do a lot of reading. If you did download cgminer, then the anti-virus issue is explained right in the documentation for the software.

Consider altcoins:
I don't think you can really generate Litecoin with the average computer.
However, there is peercoin and many others - The YouTube video above (Bitcoin Channel) talks about why this might be a good idea now.

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